I don't know if you consider this a technological advantage, but compared to Slack, Discord puts a relatively heavy emphasis on its live voice channel functiona

I don't know if you consider this a technological advantage, but compared to Slack, Discord puts a relatively heavy emphasis on its live voice channel functionality. You can join and leave them at a whim, mute and control the volume of individual users, etc. I personally also appreciate the fact that channels and servers can be grouped, and that the markup syntax supported in text chat is more compliant with markdown expectations than the markup supported by Slack.